<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.box {
				width: 800px;
				margin: 0px auto;
				height: 300px;
				background-color: yellow;
			}
			
			.item {
				width: 25%;
				border: 1px solid #f00;
				box-sizing: border-box;
				background-color: aqua;
				display: inline-block;
				height: 200px;
			}
		</style>
	</head>
	<body>
		<div class="box">
			<div class="item"></div>
			<div class="item"></div>
			<div class="item"></div>
			<div class="item"></div>
		</div>
	</body>
</html>